<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		
		
		<form action="" id="biaodan">
			用户名：<input type="text" />
			密码：<input type="password" />
			<input type="submit" />
		</form>
		
		
		
		
		邮箱：<input type="email" form="biaodan" />
		
		
		
		
	</body>
</html>
